CN105874863B - Radio communication system, base station apparatus, and radio terminal - Google Patents

Abstract

A kind of radio communications system includes radio access network (1) and radio terminal (2).Radio access network (1) includes the first base station (11) of management first community (110) and the second base station (12) for managing second community (120).Radio terminal (2) is supported to be related to carrying isolated dual link, separates the network carrying between radio terminal (2) and core network (3) in first base station (11) and the second base station (12) in carrying separation.Radio Access Network (1) is configured to (2) into radio transmitting the first control information, is related to access layer and is to be related to necessary to carrying isolated dual link.Therefore such as needed for starting to be related to carry isolated dual link control program or signaling can be provided.

Description

Radio communication system, base station apparatus, and radio terminal

technical field

The present application relates to a radio communication system in which base stations communicate with the same radio terminal in their respective cells.

Background technique

In order to improve the deterioration of communication quality due to the recent rapid increase in mobile traffic and to achieve higher speed communication, 3GPP Long Term Evolution (LTE) is designated to allow radio base stations (eNode B (eNB)) and radio terminals (users) A device (UE)) uses a carrier aggregation (CA) function in which multiple cells communicate with each other. The cells that UEs in CA can use are limited to cells of one eNB (ie, cells served or managed by the eNB). Cells used by UEs in CA are classified into a primary cell (PCell) that is used as a serving cell when CA is activated, and a secondary cell (SCell) that is additionally or subordinately used. In PCell, non-access stratum (NAS) mobility information (NAS mobility information) and security information (security input) are sent and received during radio connection (re)establishment (RRC connection setup, RRC connection re-establishment) (See Section 7.5 in Non-Patent Document 1).

In CA, the SCell configuration information transmitted from the eNB to the UE includes the SCell radio resource configuration information (RadioResourceConfigCommonSCell) shared by the UE and the SCell radio resource configuration information (RadioResourceConfigDedicatedSCell) dedicated to a specific UE. The latter information mainly indicates that the Physical layer dedicated configuration (PhysicalConfigDedicated). When cells (carriers) with different transmission timings (Timing Advance: TA) are aggregated in the uplink, configuration information (MAC_MainConfigSCell) on the Medium Access Control (MAC) sublayer is also transmitted from the eNB to the UE. However, the configuration information on the MAC sublayer only includes STAG_Id, which is an index of a TA group (TAG) representing a group of cells included in the same TA (see Section 5.3.10.4 in Non-Patent Document 2). Other configurations for the MAC sublayer in SCell are the same as those in PCell.

One of the ongoing research items in LTE standardization mainly related to the Heterogeneous Network (HetNet) environment is dual linking, in which a UE performs communication using multiple cells of multiple eNBs (see Non-Patent Document 3). Dual connectivity is used to allow the UE to use both radio resources (ie, cells or carriers) provided (or managed) by the primary base station (primary base station, primary eNB (MeNB)) and the secondary base station (secondary base station, secondary eNB (SeNB)). The process of communicating simultaneously. Dual connectivity enables inter-eNB CA in which the UE aggregates multiple cells managed by different eNBs. Since the UE aggregates radio resources managed by different nodes, dual connectivity is also referred to as "inter-node radio resource aggregation". The MeNB is connected to the SeNB through an inter-base station interface called Xn. The MeNB maintains a connection (SI-MME) to a mobility management device (Mobility Management Entity (MME)) in the core network (Evolved Packet Core) for UEs in dual connectivity. Therefore, the MeNB may be referred to as the UE's mobility management point (or mobility anchor point). For example, MeNBs are macro eNBs and SeNBs are pico eNBs or low power nodes (LPNs).

Furthermore, in dual connectivity, bearer separation for separation of network bearers (EPS bearers) on MeNB and SeNB has been studied. The term "network bearer (EPS bearer)" as used in this specification means the connection between the UE and an endpoint (ie, a Packet Data Network Gateway (P-GW)) in the Core Network (EPC) for each service provided to the UE ) configured between the virtual connections. For example, in an alternative to bearer separation, both the radio bearers (RBs) in the MeNB's cell and the SeNB's cell are mapped to one network bearer. The radio bearers (RBs) described herein mainly relate to data radio bearers (DRBs). Bearer separation will contribute to further improvement in user throughput.

Citation List

Non-patent literature

Non-Patent Document 1 3GPP TS 36.300V11.5.0 (2013-03), "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2(Release11)",March,

Non-patent document 2 3GPP TS 36.331V11.4.0 (2013-06), "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 11)", June, 2013

Non-Patent Document 3 3GPP TR 36.842V0.2.0 (2013-05), "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Study on Small Cell Enhancements for E-UTRA and E-UTRAN -Higher layer aspects (Release 12)", May, 2013

SUMMARY OF THE INVENTION

technical problem

Proper control procedures for initiating dual connectivity involving bearer separation have not been established. Therefore, the embodiments disclosed in this specification will achieve the purpose of providing the control procedures or signaling required to initiate dual connectivity involving bearer separation. Other objects and novel features will become apparent from the following description and drawings.

solution to the problem

In an embodiment, a radio communication system includes a radio access network and radio terminals. The radio access network includes a first base station managing a first cell and a second base station managing a second cell. The radio terminal supports dual connectivity involving bearer separation in which the network bearers between the radio terminal and the core network are separated on a first base station and a second base station. The radio access network is configured to transmit first control information to the radio terminal, which relates to the access stratum and is necessary for dual connectivity involving bearer separation.

In an embodiment, the base station apparatus comprises a communication control unit configured to control dual connectivity involving bearer separation in which the network bearer between the radio and the core network is separated on the base station apparatus and adjacent base stations. The communication control unit is configured to transmit first control information to the radio terminal, which relates to the access stratum and is necessary for dual connectivity involving bearer separation.

In an embodiment, the base station apparatus comprises a communication control unit configured to control dual connectivity involving bearer separation in which the network bearers between the radio and the core network are separated on the first and second base stations. The communication control unit is configured to receive, from the first or second base station, first control information related to the access layer and necessary for dual connectivity related to bearer separation, to determine whether bearer separation is required based on the first control information, and to determine whether bearer separation is required based on the first control information. A control message to control communication using dual connections.

In an embodiment, a control method comprises transmitting, from a first base station to a radio terminal, first control information related to the access stratum and necessary for dual connectivity related to bearer separation in which the radio terminal is connected to a core The network bearers between the networks are separated on the first base station and the second base station.

In an embodiment, the control method performed by the radio terminal comprises: (a) receiving, from the first or second base station, first control information related to the access stratum and necessary for dual connectivity related to bearer separation, where the bearer In the separation, the network bearers between the radio terminal and the core network are separated on the first and second base stations; and (b) determining whether bearer separation is required based on the first control information, and controlling the adoption of dual connectivity according to the first control information Communication.

In an embodiment, a program includes instructions (software code) for causing the computer to perform the above-described control method when the program is loaded into a computer.

Advantageous Effects of the Invention

According to the above-described embodiments, the control procedures or signaling required to initiate dual connectivity involving bearer separation can be provided.

Description of drawings

1A is a diagram showing an example of a user plane protocol stack for LTE layer 2 involving bearer-separated dual connectivity;

1B is a diagram showing another example of a user plane protocol stack for LTE layer 2 involving bearer-separated dual connectivity;

2 is a diagram showing a configuration example of a radio communication system according to the first to third embodiments;

3 is a sequence diagram showing an example of a control procedure for starting dual connectivity involving bearer separation according to the first embodiment;

4 is a sequence diagram showing another example of a control procedure for starting dual connectivity involving bearer separation according to the first embodiment;

5 is a sequence diagram showing an example of a control procedure for starting dual connectivity involving bearer separation according to the second embodiment;

6 is a sequence diagram showing an example of a control procedure for starting dual connectivity involving bearer separation according to the third embodiment;

7 is a block diagram showing a configuration example of the MeNB according to the first to third embodiments;

8 is a block diagram showing a configuration example of the SeNB according to the first to third embodiments; and

9 is a block diagram showing a configuration example of the UE according to the first to third embodiments.

Detailed ways

Specific embodiments will be described in detail below with reference to the accompanying drawings. EDIT The same reference numerals are used to denote the same or corresponding elements in the various drawings, and repeated descriptions thereof are appropriately omitted for the sake of clarity of description.

The following embodiments will be described primarily with reference to the Evolved Packet System (EPS). However, these embodiments are not limited to EPS, and can be applied to other mobile communication networks or systems, such as 3GPP Universal Mobile Telecommunications System (UMTS), 3GPP2CDMA2000 system (1×RTT, High Speed Packet Data (HRPD)), Global System for Mobile Communications ( GSM)/General Packet Radio Service (GPRS) systems and WiMAX systems

first embodiment

First, with respect to certain embodiments, including the present exemplary embodiment, a number of examples involving dual connectivity with bearer separation are described. Figures 1A and 1B show two alternatives to the protocol stacks for the user plane of LTE layer 2 involving carrying separate dual connectivity (eg, inter-node radio resource aggregation). In bearer separation, a network bearer (EPS bearer) configured between an endpoint (ie, P-GW) of the core network (EPC) and the UE is separated on the MeNB 11 and the SeNB 12 . In the alternative shown in Figures 1A and 1B, EPS bearer #2 is split on MeNB 11 and SeNB 12. EPS bearer #1 shown in Figures 1A and 1B is a normal bearer without manual bearer separation. Therefore, the EPS bearer #1 is mapped to the radio bearer in the cell of the MeNB 11 in a one-to-one correspondence.

In the alternative shown in Figures 1A and 1B, a Data Radio Bearer (DRB) with a one-to-one association with EPS bearer #2 is placed at the Packet Data Convergence Protocol (PDCP) sublayer, Radio Link Control (RLC) The sublayer or MAC sublayer of layer 2 is split on MeNB 11 and SeNB 12 .

Specifically, in the alternative shown in Figure 1A, the PDCP entity of MeNB 11 terminates S1-U of EPS bearer #2. In other words, one S1 bearer and one data radio bearer (DRB) mapped to EPS bearer #2 terminate at the PDCP sublayer of MeNB 11 .

Furthermore, in the alternative shown in Figure 1A, MeNB 11 and SeNB 12 have separate RLS entities for bearer separation, and one DRB (or PDCP bearer) terminated at MeNB 11 is in the RLC bearer and SeNB of MeNB 11 12 RLC bearer separation. Note that the term "PDCP bearer" means a connection terminated at the PDCP sublayer of the eNB and the UE. PDCP bearers may also be referred to as PDCP Protocol Data Units (DPCP PDUs). In the example shown in FIG. 1A , there is one PDCP bearer for EPS bearer #2 to be detached, and this PDCP bearer terminates at MeNB 11 and UE 2 . On the other hand, the term "RLC" bearer means a connection terminated at the RLC sublayer of the eNB and the UE. RLC bearers may also be referred to as RLC PDUs or logical channels. In the example shown in Figure 1A, there are two independent RLC bearers associated with EPS bearer #2. One of the two RLC bearers is terminated at MeNB 11 and UE 2, and the other is terminated at SeNB 12 and UE 2. Therefore, in the architecture shown in Figure 1A, UE 2 is required to have two independent RLC entities associated with PES bearer #2 to be detached.

As in the alternative shown in Figure 1A, in the alternative shown in Figure IB, the PDCP entity of MeNB 11 terminates at S1-U of EPS bearer #2. Also, regarding EPS bearer #2 to be detached, MeNB 11 has a master RLC entity and SeNB 12 has a slave RLC entity. In the alternative shown in Figure IB, UE 2 is required to have only one RLC entity associated with EPS bearer #2 to be detached. In the downlink, the slave RLS entity of SeNB 12 receives RLC PDUs from the master RLC entity of MeNB 11, which are generated by the master RLC entity and allocated to slave RLCs for transmission.

The following description is based on the assumption that, from a conventional carrier aggregation (CA) point of view, the cell of the MeNB 11 may be referred to as a PCell, and the cell of the SeNB 12 may be referred to as an SCell. However, the scope of the present embodiment is not limited thereto. For example, when a radio terminal (UE) performs CA (intra-SeNB CA) on multiple cells of the SeNB 12 (ie, at least multiple downlink component carriers (CCs) during dual connectivity, the SeNB 12 subject to CA may be One of the cells is defined as a PCell or a pseudo PCell that operates in the same way as a PCell. The pseudo PCell may also be called an anchor cell, a primary cell, a control cell, etc. In the CA of the cell of the SeNB 12, the preceding cell (the cell of the SeNB 12 PCell) has a similar role to PCell in conventional CA. For example, in PCell of SeNB 12, eNB (SeNB) performs SCell configuration or SCell activation/deactivation for CA, and UE performs Radio Link Monitoring (RLM)/Radio Link failure (RLF) detection. In addition, the UE may perform, for example, transmission of L1/L2 control information (eg, CQI, CSI, HARQ feedback, scheduling request) in the uplink control channel (PUCCH), contention-based random access Incoming channel (RACH) (the preamble) and reception of the response to the RACH preamble (random access response (RAR)). The latter cell (pseudo PCell of SeNB 12) has as a user plane with information about the conventional CA (UP) of the controlled PCell-enabled cell. In the pseudo PCell of the SeNB 12, the UE may perform, for example, the transmission of L1/L2 control information in the uplink control channel (PUCCH), the preamble of the contention-based RACH ( ) and reception of the response to the RACH preamble (RAR). Furthermore, in the UE, the cell of the MeNB 11 and the cell of the SeNB 12 do not necessarily need to have a hierarchical relationship (PCell and SCell) or a master-slave relationship.

The user plane protocol stack for dual connectivity involving bearer separation is not limited to the alternatives shown in Figures 1A and 1B. For example, in bearer separation, two radio bearers can be mapped to one network bearer (EPS bearer). 1A and 1B, it can be expressed that EPS bearer #2 is mapped to both the radio bearer (RB) in the cell (PCell) of the MeNB 11 and the radio bearer in the cell (SCell) of the SeNB 12. For convenience of explanation, the radio bearer in the cell (PCell) of the MeNB 11 is defined herein as the primary RB (P-RB), and the radio bearer (RB) in the cell (SCell) of the SeNB is defined herein as the secondary RB (S-RB). Since bearer separation is mainly applied to data radio bearers (DRBs), P-RBs and S-RBs may also be referred to as P-DRBs and S-RDBs, respectively. For example, MeNB 11 may terminate S1-U of EPS bearer #2, and MeNB 11 and SeNB 12 may have independent PDCP entities. Furthermore, in a new layer above the PDCP entity of MeNB 11, the downlink S1-U packet flow of EPS bearer #2 can be separated on the PDCP entity of MeNB 11 and the PDCP entity of SeNB 12. In this case, there are two independent PDCH bearers for EPS bearer #2. One of the two PDCP bearers is terminated at MeNB 11 and UE 2 , and the other is terminated at SeNB 12 and UE 2 .

FIG. 2 shows a configuration example of a radio communication system according to some embodiments including the present embodiment. The present radio communication system includes a radio access network (RAN) 1 , a radio terminal (UE) 2 and a core network 3 . In EPS, the RAN 1 is the Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) and the Core Network 3 is the Evolved Packet Core (EPC). E-UTRAN1 includes base stations (evolved NodeBs (eNBs)) 11 and 12 . The eNB 11 manages the cell 110 and the eNB 12 manages the cell 12 . The UE 2 is connected to the eNBs 11 and 12 by means of the radio access technology. The EPC 3 is accessed from the UE 2 through the E-UTRAN 1 and provides the UE 2 with a connection service (eg, Internet Protocol (IP) connection service) for connecting to an external network (Packet Data Network (PDN)). Additionally, Figure 2 shows the HetNet environment. Specifically, the cell 110 shown in FIG. 2 has a larger coverage area than the cell 120 . FIG. 2 also shows a hierarchical cell configuration in which cell 120 is located within cell 110 . However, the cell configuration shown in FIG. 2 is only an example. For example, cells 110 and 120 may have the same degree of coverage. In other words, the radio communication system according to the present embodiment is applicable to a homogeneous network environment.

The E-UTRAN 1 and UE 2 according to this embodiment support dual connectivity involving bearer separation. Specifically, while using the cell 110 of the eNB (ie, MeNB) 11 as the primary cell (PCell), the UE 2 may use the cell 120 of the eNB (ie, SeNB) 12 as the secondary cell (SCell). UE 2 receives and/or transmits data for one EPS bearer subject to bearer separation through PCell 110 and SCell 120.

In order to initiate dual connectivity involving bearer separation, the E-UTRAN 1 and UE 2 according to the present embodiment perform control procedures or signaling as described below. The E-UTRAN 1 is configured to transmit to the UE 2 about the first control information, which relates to the access stratum and is necessary for dual connectivity involving bearer separation. The UE 2 is configured to receive the first control information from the E-UTRAN 1, determine whether bearer separation is required based on the first control information (ie, based on the decoding result of the first control information), and control the adoption of the bearer separation according to the first control information. Communication to bearer split dual connections. To determine whether clarification separation is required based on the first control information, the UE 2 may consider, for example, whether to include configuration information on bearer separation, whether to include an explicit indication (eg, a flag) to instruct bearer separation to be performed, or whether to include to perform bearer separation Required radio resource control information. The first control information on the access stratum to be transmitted from the E-UTRAN to the UE 2 may include at least one of the following information items (1) to (5):

(1) Radio Bearer (RB) configuration information about P-RBs and S-RBs;

(2) Control information about the scheduling request (SR);

(3) Control information on uplink (UL) transmission power control;

(4) Control information on the generation of uplink (UL) MAC PDUs; and

(5) Control information on a terminal measurement report (UE measurement report).

(1) RB configuration information about P-RB and S-RB

The information items (1) to (5) will be successively described below. The RB configuration information on P-RB and S-RB indicates the mapping of two RBs (ie, P-RB and S-RB) in PCell 110 and SCell 120 to one EPS bearer. This RB configuration information is valid in architectures where one EPS bearer is mapped to both the P-RB in PCell 110 and the S-RB in SCell 120. The RB configuration information on the P-RB and the S-RB may indicate that the EPS bearer identity common to the P-RB is also set to the S-RB. For example, the RB configuration information may indicate that the EPS bearer identity associated with the EPS radio bearer identity (or DRB identity) of the P-RB is also associated with the EPS radio bearer identity (or DRB identity) of the S-RB. Alternatively, the RB configuration information may indicate that the same EPS bearer identity and EPS radio bearer identity (or DRB identity) as those of the P-RB are set to the S-RB.

Alternatively, the difference between RB configuration information on P-RB and S-RB and SCell configuration information in normal CA (intra-eNB CA) will now be described. In normal CA (intra-eNB CA), the eNB transmits the SCell configuration to the UE through the PCell, and the UE performs the SCell configuration. The SCell configuration in normal CA includes dedicated (per UE) radio resource configuration information for the SCell (RadioResourceConfigDedicatedSCell). Configuration information in normal CA includes SCell physical channel configuration information, but does not include any information about radio bearers (RBs). This is because the only functions required for the SCell in Cinderella CA are only the functions of the PHY layer and the MAC layer (ie, the RLC sublayer and PDCP sublayer of the SCell are the same as those of the PCell), and therefore no SCell's Radio bearer configuration (ie, mapping between EPS bearers and radio bearers).

On the other hand, the architectural requirement in which one EPS bearer is mapped to both the P-RB in PCell 100 and the S-RB in SCell 120 indicates that one EPS bearer is mapped to radio bearers of different eNBs (MeNB 11 and SeNB 12) Information. In other words, since the SCell configuration method adopted in normal CA( ) lacks the radio bearer configuration procedure for SCell, it is difficult in which one EPS bearer is mapped to both the P-RB in PCell 110 and the S-RB in SCell 120. The SCell configuration method in the normal CA is applied to the SCell configuration in the architecture of the original author. Therefore, as described in this article, new RB configuration information different from normal CA is required. Note that the new RB configuration information is configuration information especially about S-RBs, and thus may also be referred to as S-RB configuration information.

(2) Control information about SR

When there is data to transmit to the UE 2, a scheduling request (SR) is transmitted from the UE to the eNB to request allocation of uplink radio resources. The UE transmits the SR in a Physical Uplink Control Channel (PUCCH) or by using a random access procedure using a random access channel (RACH). When data for transmitting EPS bearers via bearer separation is available in UE 2, the control information on the SR indicates the cell of MeNB 11 (eg PCell 110 ) or the cell of SeNB 12 (eg SCell 120 ) to which the SR is to be transmitted ). For example, the control information on the SR may explicitly indicate one of the MeNB 11 (PCell 110 ) and the SeNB 12 (SCell 120 ) to which the SR (or RACH for transmitting the SR) is to be transmitted. Alternatively, the control information on the SR may indicate that the UE 2 is allowed to select the destination of the SR (or RACH for transmitting the SR). Specifically, the control information on the SR may specify signaling enabling selection of the destination of the SR (or the RACH used to transmit the SR), or may instruct the UE 2 to select the destination of the SR. With this control, the UE 2 can appropriately determine the destination of the SR even during the execution of bearer separation.

(3) Control information about UL transmission power control;

During the performance of bearer separation, an upper limit on the total transmit power for uplink transmissions in the cell of MeNB 11 (eg, PCell 110 ) and the cell of SeNB 12 (eg, SCell 120 ) may be specified. When UE 2 is scheduled for uplink transmissions in PCell 110 and uplink transmissions in SCell 120 in the same subframe (LTE subframe) (ie, when UE 2 receives transmissions for both PCell 110 and SCell 120) UL grant), the control information on UL transmission power control can be applied to control the uplink transmission power in UE 2. Alternatively, when the data or control information to be transmitted in the uplink is available in both PCell 110 and SCell 120, the control information on UL transmission power control may be applied for controlling the uplink in UE 2 Procedure for transmitting power.

The control information may indicate, for example, the maximum transmit power applied to the total transmit power used for uplink transmissions in PCell 110 and SCell 120.

UE 2 may first determine the transmit power in PCell 110 and then determine the transmit power in SCell 120. In other words, UE 2 may perform uplink transmission in SCell 120 by using the remaining transmission power not used for uplink transmission in PCell 110 .

Alternatively, UE 2 may perform uplink transmission in PCell 110 by using the remaining transmission power not used for uplink transmission in SCell 120. With this control, UE 2 can appropriately perform UL transmission power control even during the execution of bearer separation.

Alternatively, an upper limit of transmission power may be specified for each of uplink transmissions in PCell 110 and uplink transmissions in SCell 120 during the implementation of bearer separation. In this case, the control information on UL transmission power control may indicate the first and second maximum transmission power applied to uplink transmission in PCell 110 and uplink transmission in SCell 120, respectively. The control information may indicate a configuration value of the first maximum transmission power and an offset value (positive or negative value) for obtaining the second maximum transmission power. A value obtained by adding the offset value to the configured value of the first maximum transmission power may be used as the second maximum transmission power applied to uplink transmission in the SCell 120 . With this control, UE 2 can appropriately perform UL transmission power control even during the execution of bearer separation.

Control information on UL MAC PDU generation

Even during the execution of bearer separation, the UE 2 shall consider the PES bearer QoS (QoS Class Identifier (QCI), Guarantee Bits) for each of all EPS bearers including bearers subject to bearer separation and bearers not subject to bearer separation. rate (GBR), aggregated maximum bit rate (AMBR), etc.) to generate MAC PDUs. One MAC PDU may also be referred to as a transport block. Therefore, when UE 2 is scheduled in the same subframe (LTE subframe) for uplink transmissions in MeNB 11's cell (eg, PCell 110) and for uplink transmissions in SeNB 12's cell (eg, SCell 120) When the control information on the generation of the UL MAC PDU is applied to the UE 2 for generating the first MAC PDU for uplink transmission in PCell 110 and the second MAC PDU for uplink transmission in SCell 120 Procedure for MAC PDUs.

The control information on the generation of the UL MAC PDU may indicate, for example, a first priority bit rate (PBR) applied to the generation of the first MAC PDU and a first priority bit rate (PBR) applied to the generation of the second PAC PDU for one logical channel of the EPS bearer subject to bearer separation Second PBR. In other words, for one logical channel of a PES bearer subject to bearer separation, the information may specify two PBRs, a first PBR for transmission in PCell 110 and a second PBR for transmission in SCell 120. In this case, the first and second PBRs may be configured such that the total number (arithmetic sum) of the first and second PBRs becomes a PBR suitable for one logical channel that is subjected to carrying separate EPS bearers. This control prevents the transmission of an excessively large amount of uplink data for EPS bearers that are subject to bearer separation compared to uplink data for EPS bearers that are not subject to bearer separation (i.e., prevents an excessive amount of EPS bearers that would be subject to bearer separation). The uplink data is included in the MAC PDU).

The control information on the generation of the UL MAC PDU may indicate the first MAC PDU or the second MAC PDU for which priority bit rate (PBR) applied to the logical channel of the EPS bearer subject to bearer separation should be guaranteed preferentially. It may be desirable for UE 2 to preferentially use uplink resources allowed in PCell 110 for transmission of EPS bearers not subject to bearer separation. This is because uplink transmission of EPS bearers subject to bearer separation may use uplink resources allowed in SCell 120. Therefore, the control information on the generation of the UL MAC PDU may indicate that the PBR applied to the logical channel of the EPS bearer subject to bearer separation should be guaranteed preferentially for the second MAC PDU. This control can suppress transmission of an excessively large amount of uplink data for EPS bearers subject to bearer separation compared to uplink data for EPS bearers not subject to bearer separation.

The control information on the generation of the UL MAC PDU may include a configuration value used to weight the PBR (first MAC PDU) applied to the PCell 110 and the PBR (second MAC PDU) applied to the SCell 120 during the performance of bearer separation (weighting factor). Also, the control information may include a configuration value (weighting factor) for weighting the PBR applied to the logical channel of the EPS bearer subjected to bearer separation and the PBR applied to the logical channel of the EPS bearer not subjected to bearer separation.

(5) Control information on terminal measurement report (UE measurement report)

LTE specifies the following events that trigger terminal measurement packets (UE measurement reports).

- Event A1 (service becomes better than threshold)

- Event A2 (service becomes worse than threshold)

— Event A3 (neighbor becomes better than PCell offset)

— Event A4 (neighbors become better than threshold)

- Event A5 (PCell becomes worse than Threshold 1 and Neighbor becomes better than Threshold 2)

- Event A6 (neighbors become better than SCell offsets)

The term "serving (cell)" refers to each cell configured and activated by the network (ie, the eNB) so that the UE 2 can use the cell for data communication. For example, when UE 2 uses two cells in conventional CA, each of the two cells is a serving cell, and the cell of interest (ie, the serving cell to compare) can be determined from the cell in which the measurement reporting configuration is performed . That is, the cell to which the configuration was transmitted (the cell where the UE 2 received the configuration) may be regarded as the serving cell. On the other hand, the term "neighbor (cell)" is basically a cell other than the serving cell. However, in events A3 and A5, a serving cell other than the serving cell of interest (ie, the comparison reference) may also be considered as one of the neighbor cells.

The control information on the terminal measurement report may indicate any one or more of the above-mentioned events, or may indicate a newly defined event for bearer separation. The PCell may be the cell 110 of the MeNB 11 or the cell 120 of the SeNB 12 when the control information indicates any one or more of the above events. Furthermore, the SCell may be a cell other than the cell 110 of the MeNB 11 (if the cell is configured), the cell 120 of the SeNB 12 or a cell other than the cell 120 of the SeNB 12 (if the cell is configured). Examples of new events may include the following events A7-A10 (numbers assigned to events are illustrative only and not limiting):

- event A7 (neighbor becomes better than pseudo PCell offset);

- event A8 (pseudo PCell becomes worse than threshold 1 and neighbors becomes better than threshold 2);

- Event A9 (SeNB's neighbors become better than threshold); and

- Event A10 (SeNB's neighbor becomes better than SCell offset).

Next, several examples of control procedures for initiating dual connectivity involving bearer separation (eg, inter-node radio resource aggregation) are described. FIG. 4 is a sequence diagram showing an example of a control procedure for starting dual connectivity involving bearer separation. In the example shown in Figure 3, dual connectivity involving bearer separation is configured during a procedure in which UE 2 transitions from RRC_IDLE state to RRC_CONNECTED state to start a service (eg, FTP download). Upon determining that bearer separation is necessary (or valid) for UE 2, E-UTRAN 1 initiates the configuration of bearer separation. Furthermore, in the example shown in FIG. 3 , one EPS bearer is mapped to a primary RB (P-RB) in PCell 110 and a secondary RB (S-RB) in SCell 120 . In the example shown in FIG. 3 , the UE first establishes the P-RB in PCell 110 and then establishes the S-RB in SCell 120 .

In step S11, the UE 2 performs a connection establishment procedure with the E-UTRAN 1. In the connection establishment procedure of step S11, RRC connection is first established between MeNB 11 and UE 2 (step 1), and then initial security activation and establishment of DRB (ie, P-RB) is performed (step 2). Step 1 includes transmission of an RRC connection request message from UE 2 to MeNB 11 , transmission of an RRC connection setup message from MeNB 11 to UE 2 and transmission of an RRC connection setup complete message from UE 2 to MeNB 11 . Step 2 includes transmission of an RRC connection reconfiguration message from MeNB 11 to UE 2 and transmission of an RRC connection reconfiguration complete message from UE 2 to MeNB 11 . In step 2, the configuration information about the P-RB is included in the RRC connection reconfiguration message.

In step S12, E-UTRAN 1 transmits the S-RB configuration (bearer separation configuration) to UE 2. The S-RB configuration may be transmitted by MeNB 11 or by a combination of MeNB 11 and SeNB 12 . In other words, a portion of the S-RB configuration may be transmitted from MeNB 11 to UE 2, and the remainder of the S-RB configuration may be transmitted from SeNB 12 to UE 2. The S-RB configuration may be transmitted using an RRC connection reconfiguration message as shown in FIG. 3 .

In step S13, the UE 2 reports the completion of the S-RB configuration to the E-UTRAN 1. UE 2 may report the completion of the S-RB configuration to MeNB 11 or SeNB 12 or both. The completion of the S-RB configuration may be transmitted using an RRC connection reconfiguration complete message as shown in FIG. 3 .

In step S14, the E-UTRAN 1 notifies the UE 2 of the information on the start of using the S-RB (Bearer Separation Activation). The notification of the start of using the S-RB may be transmitted from the MeNB 11 or the SeNB 12 . Note that step S14 may be omitted. In this case, the use of the S-RB can be completed at the beginning of step S13.

The S-RB configuration (bearer separation configuration) transmitted from the E-UTRAN 1 to the UE 2 in step S12 of FIG. 3 corresponds to the first control information on the access stratum described above. S-RB configuration (Bearer Separation Configuration) is a generic term (logical term) for configuration elements included in the following four messages.

-DRB-ToAddMod_Sbearer;

-RadioResourceConfigCommon_Sbearer;

-RadioResourceConfigDedicated_Sbearer; and

-BearerSplitResourceConFig

These configuration elements may be transmitted to UE2 as one Information Element (IE) or as multiple Information Elements (IEs).

DRB-ToAddMod_Sbearer indicates S-RB configuration (eg, eps-BearerIdentity, drb-Identity, pdcp-Config, and rlc-Config). As described above, eps-BearerIdentity and drb-Identity of S-RB may be the same as eps-BearerIdentity and drb-Identity of P-RB. However, the drb-Identity of the P-RB may be different from that of the P-RB.

RadioResourceConfigCommon_Sbearer indicates the resource configuration of the S-RB (eg, prach-Config, pdsch-ConfigCommon, pusch-ConfigCommon, pucch-ConfigCommon, uplinkPowerControlCommon and tdd-Config, dl-Bandwidth). In other words, RadioResourceConfigCommon_Sbearer includes information on common radio resources in which S-RBs are configured (established).

RadioResourceConfigDedicated_Sbearer indicates the resource configuration of the S-RB (eg, physicalConfigDedicated and mac-MainConfig). In other words, RadioResourceConfigDedicated_Sbearer includes dedicated radio resource information on a cell in which the S-RB is configured (established). The above-mentioned DRB-ToAddMod_Sbearer may be transmitted as one element contained in this IE.

BearerSplitResourceConfig indicates a specific configuration for a specific bearer split. The specific configuration of bearer separation includes control parameters related to the functions used during the execution of bearer separation. These control parameters may be used to configure functions that require a different configuration for bearer separation than when bearer separation is not performed, or to configure new (special) functions that are used only during the execution of bearer separation. As described above, these control parameters may include at least one of: (a) control information on scheduling request (SB) and random access channel (RACH); (b) on UL transmit power control (UL power control) ); and (c) control information on the generation of UL MAC PDUs (eg, control control information on logical channel prioritization (LCP)).

FIG. 4 is a sequence diagram showing another example of a control procedure for initiating dual connectivity involving bearer separation. The example shown in FIG. 4 differs from the example shown in FIG. 3 in that the P-RB and S-RB are configured simultaneously during the procedure in which the UE 2 transitions from the RRC_IDLE state to the RRC_CONNECTED state.

In steps S21 to S25, the UE 2 performs a connection establishment procedure with the E-UTRAN 1. That is, steps S21 to S25 correspond to step S11 shown in FIG. 3 . Steps S21 to S23 correspond to the RRC connection establishment procedure (step 1), and steps S24 and S25 correspond to the DRB establishment procedure (step 2).

In step S21, the UE transmits an RRC connection request message to E-UTRAN 1. In step S22, E-UTRAN 1 transmits an RRC connection setup message to UE 2. This RRC Connection Setup message contains both the PCell 110 configuration and the SCell 120 configuration. In step S23, UE 2 transmits an RRC connection setup complete message to E-TURAN 1. This RRC Connection Setup Complete message indicates the completion of the configuration of PCell 110 and SCell 120.

In step S24, E-UTRAN 1 transmits an RRC connection reconfiguration message to UE 2 to establish DRBs (ie both P-RB and S-RB). This RRC connection reconfiguration message contains both the configuration of the P-RB and the configuration of the S-RB. In step S25, the UE2 type E-UTRAN 1 transmits an RRC connection reconfiguration complete message. This RRC connection reconfiguration complete message indicates the completion of the configuration of P-RB and S-RB.

In step S25, the E-UTRAN 1 informs the UE 2 about the start of using the S-RB (Bearer Separation Activation). Similar to step S14 in FIG. 3, step S25 may be omitted.

In the procedure shown in Figure 4, a portion of the SCell configuration (eg, BearerSplitResourceConfig) may be transmitted in step S24 instead of step S22.

The processing performed by the E-UTRAN 1 in the procedure shown in FIG. 4 may be performed by the MeNB 11 , or may be performed by a combination of the MeNB 11 and the SeNB 12 .

Figures 3 and 4 show an example of the control or signaling performed when the UE 2 transitions from the RRC_IDLE state to the RRC_CONNECTED state to initiate dual connectivity involving bearer separation. However, this control or signaling for dual connectivity involving bearer separation may be when UE 2 is already in RRC_CONNECTED state in PCell 110 and in ECM-CONNECTED state with EPC 3 and when UE 2 is in PCell 110 from EPC 3 Executed when the service is received (ie, when the EPS bearer is configured).

As can be understood from the above description, according to the present embodiment, it is possible to provide the control procedures or signaling required to initiate dual connectivity involving bearer separation.

Second Embodiment

In this embodiment, a modification of the first embodiment is described. A configuration example of the radio communication system according to the present embodiment is similar to that shown in FIG. 2 . In this embodiment, MeNB 11 exchanges signaling messages with SeNB 12 through an inter-base station interface (eg, Xn interface), and applies a configuration to SeNB 12 involving dual connectivity (eg, inter-node radio resource aggregation) involving bearer separation. For example, the MeNB 11 may transmit to the SeNB 12 second control information (ie, configuration information for bearer separation) required to start a dual link involving bearer separation. At this time, the SeNB 12 may determine whether the second control information (bearer separation configuration information) received from the MeNB 12 is acceptable. If the second control information is not acceptable, the SeNB 12 may inform the MeNB 11 that the second control information is not acceptable, or may suggest an acceptable alternative configuration to the MeNB 11. At least a part of the content of the second control state (carrying separate configuration information) may be the same as part of the content of the first control information described above. The MeNB 11 and the SeNB 12 may exchange signaling messages through the X2 interface or the S1 interface instead of using the Xn interface.

FIG. 5 is a sequence diagram showing an example of a control procedure for starting dual connectivity involving bearer separation in the present embodiment. As in the example shown in Figure 3, in the example shown in Figure 5, the configuration involves bearer separation during the procedure in which the UE 2 transitions from the RRC_IDLE state to the RRC_CONNECTED state to start a service (eg FTP download) of dual connections. When determining that bearer separation is necessary (or effective) for UE 2, MeNB 11 indicates the configuration of bearer separation. As in the example shown in FIG. 3 , in the example shown in FIG. 5 , one EPS bearer is mapped to the primary RB (P-RB) in PCell 110 and the secondary RB (S-RB) in SCell 120 ) both. Like in the example shown in FIG. 3 , in the example shown in FIG. 5 , UE 2 first establishes P-RBs in PCell 110 and then establishes S-RBs in SCell 120 .

The process of step S31 may be performed between the MeNB 11 and the UE 2 in the same manner as the process of step S11 shown in FIG. 3 . In step S32 of Fig. 5, the MeNB 11 sends a request for (execution or configuration of) bearer separation to the SeNB 12. In step S33, the SeNB 12 sends a response to the MeNB 11 as to whether (the execution or configuration of) bearer separation is accepted. If (the execution or configuration of) bearer separation is accepted in the SeNB 12, the processing of steps S34 to S36 is performed. The processing of steps S34 to S36 may be performed between the MeNB 11 and the UE 2 in the same manner as the processing of steps S12 to S14 shown in FIG. 3 .

The configuration information for bearer separation may also be sent when a request for bearer separation is sent from the MeNB 11 to the SeNB 12 in step S32 shown in FIG. 5 . The configuration information of bearer separation indicates, for example, the mapping between S-RBs and EPS bearers subject to bearer separation. The configuration information of bearer separation may include EPS bearer identifications of EPS bearers subjected to bearer separation and radio bearer identifications (DRB identifications) of S-RBs. Alternatively, the configuration information for bearer separation may include the EPS bearer identification of the EPS bearer, and may not include the radio bearer identification (DRB identification) of the S-RB. In this case, the SeNB 12 may determine the radio bearer identification (DRB identification) of the S-RB, and may notify the MeNB 11 of the determined radio bearer identification (DRB identification) of the S-RB in step S33.

The configuration information for bearer separation transmitted from the MeNB 11 to the SeNB 12 in step S32 shown in FIG. 5 may include the following information transmitted in step S12 shown in FIG. 3 (and step S34 shown in FIG. 5 ) At least one of the items:

-DRB-ToAddMod_Sbearer;

- identification information (eg ECGI and/or PCI) about the cell of the SeNB subject to bearer separation;

-RadioResourceConfigCommon_Sbearer;

-RadioResourceConfigDedicated_Sbearer; and

-BearerSplitResourceConFig

In addition to or as an alternative to these information items, the bearer separation configuration information may include at least one of the following:

- identification information of UE 2 (eg C-RNTI and/or TMSI);

— information about safety; and

- information on the use of radio resources.

Examples of security-related information include KeNB, KeNB*, NextHopChainingCount, and SecurityAlgorithmConFig. However, the security-related information may include other security information at the Access Stratum (AS) layer. Examples of information on radio resource usage include a request and/or a reporting period for reporting the usage status (resource status) of resources in the SeNB 12 .

As can be understood from the above description, according to the present embodiment, a control procedure or signaling between the MeNB 11 and the SeNB 12 required to initiate dual connectivity involving bearer separation can be provided.

Third Embodiment

In this embodiment, modifications of the first and second embodiments are described. A cooperation example of the radio communication system according to the present embodiment is similar to that shown in FIG. 2 . Similar to the second embodiment, the MeNB 11 according to the present embodiment exchanges signaling messages with the SeNB 12 through an inter-base station interface (eg, Xn interface), and applies a configuration involving dual connectivity to bearer separation to the SeNB 12 .

FIG. 6 is a sequence diagram showing an example of a control procedure for starting dual connectivity involving bearer separation in the present embodiment. Similar to the example shown in Figure 4, in the example shown in Figure 6, the P-RB and S-RB are configured simultaneously during the procedure in which the UE 2 transitions from the RRC_IDLE state to the RRC_CONNECTED state.

The processing of steps S41 to S43 may be performed between the MeNB 11 and the UE 2 in the same manner as the processing of steps S21 to S23 shown in FIG. 4 . In step S44 shown in FIG. 6, the MeNB 11 performs NAS service setup with the ECP 3, and configures an EPS bearer (NAS connection establishment). At this time, the MeNB 11 may send a request for bearer separation, a notification to perform bearer separation, and the like to the EPC 3 (specifically, the MME).

The processing of steps S45 and S46 may be performed between the MeNB 11 and the SeNB 12 in the same manner as the processing of steps S32 and S33 shown in FIG. 5 . Specifically, in step S45, the MeNB 11 requests the SeNB 12 to perform (configure) bearer separation. In step S46, the SeNB 12 sends a response to the MeNB 11 as to whether the execution (configuration) of bearer separation is accepted.

The processing of steps S47 to S49 may be performed between the MeNB 11 and the UE 2 in the same manner as the processing of steps S24 to S26 shown in FIG. 4 . If the execution (configuration) of bearer separation is accepted in the SeNB 12 in the procedures of steps S45 and S46, the MeNB 11 transmits to the UE 2 in step S47 an RRC connection re-connection containing both the P-RB configuration and the S-RB configuration Configuration messages. On the other hand, if the performance (configuration) of bearer separation is rejected in the SeNB, in S47, the MeNB 11 transmits an RRC connection reconfiguration message to the UE 2, which contains the P-RB configuration and does not contain the S-RB configuration.

As can be understood from the above description, according to the present embodiment, a control procedure or signaling between the MeNB 11 and the SeNB 12 required to initiate dual connectivity involving bearer separation can be provided.

Next, configuration examples of the MeNB 11, the SeNB 12, and the UE 2 according to the first to third embodiments are described. FIG. 7 is a block diagram showing a configuration example of the MeNB 11 . The radio communication unit 111 receives the uplink signal transmitted from the UE 2 via the antenna. The received data processing unit 113 restores the received uplink signal. The obtained reception data is transmitted via the communication unit 114 to other network nodes, such as a Serving Gateway (S-GW) or an MME of the EPC 3 or another eNB. For example, uplink user data received from UE 2 is transmitted to the S-GW within EPC 3. The NAS control data contained in the control data received from the UE 2 is transmitted to the MME within the EPC 3 . Further, the reception data processing unit 113 receives control data to be transmitted to the SeNB 12 from the communication control unit 115 , and transmits the received control data to the SeNB 12 via the communication unit 114 .

The transmit data processing unit 112 receives user data addressed to the UE 2 from the communication unit 114, and performs error correction coding, rate matching, interleaving, etc., to thereby generate a transport channel. Furthermore, the transmit data processing unit 112 adds control information to the data sequence of the transport channel to thereby generate a sequence of transmission symbols. The radio communication unit 111 generates downlink data by performing processing including carrier modulation based on the transmission symbol sequence, frequency conversion, and signal amplification, and transmits the generated downlink signal to the UE 2 . The transmission data processing unit 112 receives control data to be transmitted to the UE 2 from the communication control unit 115 , and transmits the received control data to the UE 2 via the radio communication unit 111 .

The communication control unit 115 controls dual connectivity involving bearer separation. The communication control unit 115 is configured to transmit first control information to the UE 2 via the transmit data processing unit 112 and the radio communication unit 111, which relates to the access stratum and is necessary for dual connectivity involving bearer separation. In the second and third embodiments, the communication control unit 115 is configured to send radio bearer (RB) configuration information to the SeNB 12 via the communication unit 114, which indicates the mapping between S-RBs and EPS bearers subject to bearer separation.

FIG. 8 is a block diagram showing a configuration example of the SeNB 12 . The functions and operations of the radio communication unit 121, the transmission data processing unit 122, the reception data processing unit 123, and the communication unit 124 shown in FIG. 8 are the same as the corresponding elements in the MeNB 11 shown in FIG. 7, ie, the radio communication unit 111, Those of the transmission data processing unit 112, the reception data extraction unit 113, and the communication unit 114 are the same.

The communication control unit 125 of the SeNB 12 controls dual connectivity involving bearer separation. In the second and third embodiments, the communication control unit 125 is configured to receive radio bearer (RB) configuration information from the MeNB 11 via the communication unit 124, which indicates the mapping between S-RBs and EPS bearers subject to bearer separation.

FIG. 9 is a block diagram showing a configuration example of the UE 2 . The radio communication unit 21 is configured to support dual connectivity and simultaneously communicate in multiple cells (PCell 110 and SCell 120) served by different eNBs (MeNB 11 and SeNB 12). Specifically, the radio communication unit 21 receives downlink signals from one or both of the MeNB 11 and the SeNB 12 via an antenna. The reception data processing unit 22 recovers reception data from the received downlink signal, and transmits the recovered data to the data control unit 23 . The data control unit 23 uses the received data according to a predetermined purpose. The transmission data processing unit 24 and the radio communication unit 21 generate an uplink signal by using the data for transmission supplied from the data control unit 23, and transmit the generated uplink signal to one of the MeNB 11 and the SeNB 12 or both.

The communication control unit 25 of the UE 2 controls dual connectivity involving bearer separation. As described in the first embodiment, the communication control unit 25 receives the first control information from the E-UTRAN 1 (MeNB 11 or SeNB 12), which relates to the access layer and is necessary for dual connectivity involving bearer separation, and Communication involving bearer-separated dual connectivity is controlled based on the first control information.

Other embodiments

Communication control procedures in the MeNB 11, the SeNB 12, and the UE 12 associated with dual connectivity involving bearer separation as described in the first to third embodiments can be implemented with a semiconductor processing device including an application specific integrated circuit (ASIC). . These processes may be implemented by causing a computer system including at least one processor (eg, a microprocessor, micro-processing unit (MPU), or digital signal processor (DSP)) to execute a program. In particular, one or more programs including instructions for causing a computer system to execute the algorithms described above with reference to sequence diagrams and the like can be created and supplied to a computer.

The program may be provided and provided to a computer using any type of non-transitory computer readable medium. Non-transitory computer readable media include any type of tangible storage media. Examples of non-transitory computer-readable media include magnetic storage media (such as floppy disks, magnetic tapes, hard drives, etc.), optical magnetic storage media (eg, magneto-optical disks), compact disk read only memory (CD-ROM), CD-R, CD - R/W and semiconductor memory (such as mask ROM, programmable ROM (PROM), erasable PROM (EPROM), flash ROM, random access memory (RAM), etc.). The program may be provided to a computer using any type of non-transitory computer readable medium. Examples of non-transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable medium may provide the program to a computer via wired communication lines such as electrical wires and optical fibers or wireless communication lines.

In the first to third embodiments, the LTE system is mainly described. However, as described above, the embodiments may be applied to radio communication systems other than LTE systems, such as 3GPP UMTS, 3GPP2CDMA2000 systems (1×RTT, HRPD), GSM/GPRS systems or WiMAX systems.

The above-described embodiments merely illustrate the application of the technical idea obtained by the present inventors. That is, the present technical idea is not limited to the above-described embodiments, and can of course be modified in various ways.

This application is based on the benefit of priority of Japanese Patent Application No. 2013-227472 filed on October 31, 2013, the disclosure of which is incorporated herein by reference in its entirety.

List of reference signs

1 Evolved UTRAN (E-UTRAN)

2 User Equipment (UE)

3 Evolved Packet Core (EPC)

11 Primary eNodeB (MeNB)

12 Secondary eNodeB (SeNB)

25 Communication Control Unit

110 Primary cell (PCell)

120 Secondary cell (SCell)

115 Communication Control Unit

125 Communication Control Unit

Claims (46)

1. a kind of radio communications system, comprising:

Radio access network, the radio access network include the first base station for managing first community and second community respectively With the second base station；And

Radio terminal, the radio terminal support dual link, the dual link to be related to carrying separation, wherein by described First base station and second base station separate the network carrying between the radio terminal and core network,

Wherein, the radio access network be configured to the radio terminal emit first control information, described first Control information is related to access layer, and is required for being related to the isolated dual link of the carrying, wherein

The first control information includes being applied to for generating in the radio terminal in the first community Uplink transmission the first media access control protocol data unit (MAC PDU) and for the uplink in the second community 2 configuration information of layer of the process of 2nd MAC PDU of link transmission, and

Wherein, 2 configuration information of layer includes indicating the generation of the 2nd MAC PDU prior to the first MAC The generation of PDU, to emit the information of the uplink data of the logic channel for the network carrying.

2. radio communications system according to claim 1, wherein the radio terminal is configured to receive described One control information determines whether to require the carrying to separate based on the first control information, and according to first control Information processed uses the communication of the dual link to control.

3. radio communications system according to claim 1 or 2, wherein

In carrying separation, second in the first radio bearer and the second community in the first community is wireless Both electricity carryings are mapped to the network carrying, and

The first control information includes radio bearer configuration information, the radio bearer configuration information instruction described first The mapping of radio bearer and second radio bearer to the network carrying.

4. radio communications system according to claim 1 or 2, wherein the first base station is configured to the nothing Line electric terminals transmitting the first control information, and information, second control are controlled to second Base Transmitter second Information is related to access layer, and is required for being related to the isolated dual link of the carrying.

5. radio communications system according to claim 4, wherein

In carrying separation, second in the first radio bearer and the second community in the first community is wireless Electricity carrying is mapped to the network carrying, and

The second control information includes radio bearer configuration information, and radio bearer configuration information instruction is described the Mapping between two radio bearers and the network carrying.

6. radio communications system according to claim 4, wherein the second control information includes separating about carrying Configuration information.

7. radio communications system according to claim 1 or 2, wherein the first base station is configured to instruct described Radio terminal and second base station execute the carrying separation.

8. radio communications system according to claim 1 or 2, wherein the first control information is to first base It stands or second base station indicates, when the data of the transmission for the network carrying can be used in the radio terminal, The radio terminal will should be used to request the scheduling request or random access channel of the distribution of uplink radio resources (RACH) first base station or second base station are emitted to.

9. radio communications system according to claim 1 or 2, wherein the first control information includes under being suitable for State 1 configuration information of layer of process: for being scheduled for the first community in same subframe in the radio terminal Uplink transmission and the second community in uplink transmission when, control the uplink in the radio terminal Road transimission power.

10. radio communications system according to claim 9, wherein 1 configuration information of layer instruction is applied to described the The maximum transmission power of the overall transmission power of uplink transmission in one cell and the second community.

11. radio communications system according to claim 9, wherein 1 configuration information of layer instruction is applied to described the The first maximum transmission power and transmitted applied to the uplink in the second community that uplink in one cell is transmitted The second maximum transmission power.

12. radio communications system according to claim 11, wherein 1 configuration information of layer includes described first most The Configuration Values of transimission power and the deviant with the Configuration Values for obtaining second maximum transmission power greatly.

13. radio communications system according to claim 1 or 2, wherein 2 configuration information of layer is applied to for working as It transmits and adjusts for the uplink transmission in the first community and the uplink in the second community in same subframe The mistake of the first MAC PDU and the 2nd MAC PDU are generated when spending the radio terminal in the radio terminal Journey.

14. radio communications system according to claim 13, wherein 2 configuration information of layer is indicated the first MAC PDU's The first preferential bit rate (PBR) during generation applied to the logic channel of the network carrying and the generation in the 2nd MAC PDU Period is applied to the 2nd PBR of logic channel.

15. radio communications system according to claim 13, wherein 2 configuration information of layer indicates first or second MAC PDU should preferentially guarantee the preferential bit rate of the logic channel applied to the network carrying for first or second MAC PDU (PBR)。

16. a kind of base station, comprising:

Communication control unit, the communication control unit are configured as control dual link, which was related to radio end End separates on the base station and adjacent base station with the network carrying between core network,

Wherein, the communication control unit is configured to emit to radio terminal the first control information, the first control letter Breath is related to access layer, wherein

The first control information includes being applied to for generating in the radio terminal for by the BTS management The first media access control protocol data unit (MAC PDU) and be used for by the phase that uplink in first community is transmitted 2 configuration information of layer of the process of 2nd MAC PDU of the uplink transmission in the second community of adjacent base station management, and

Wherein, 2 configuration information of layer includes indicating the generation of the 2nd MAC PDU prior to the first MAC The generation of PDU, to emit the information of the uplink data of the logic channel for the network carrying.

17. base station according to claim 16, wherein

In carrying separation, the second radio in the first radio bearer and the second community in the first community is held It carries the two and is mapped to the network carrying, and

First control information includes radio bearer configuration information, and the first and second radio bearers of instruction arrive the network carrying Mapping.

18. base station according to claim 16 or 17, wherein

The communication control unit is configured to emit the second control information to adjacent base station, is related to access layer, and be to relate to And to necessary to the isolated dual link of carrying.

19. base station according to claim 18, wherein

In carrying separation, the second radio in the first radio bearer and the second community in the first community is held It carries the two and is mapped to the network carrying, and

The second control information includes radio bearer configuration information, is indicated between the second radio bearer and the network carrying Mapping.

20. base station according to claim 18, wherein the second control information includes about carrying separation with confidence Breath.

21. base station according to claim 16 or 17, wherein the communication control unit is configured to instruct radio whole End and adjacent base station execute carrying separation.

22. base station according to claim 16 or 17, wherein the first control information indicates the base station or adjacent base It stands, radio terminal should be transmited to it for requesting when the data of the string for the network carrying can be used in radio terminal The scheduling request or random access channel (RACH) of the distribution of uplink radio resource.

23. base station according to claim 16 or 17, wherein the first control information includes 1 configuration information of layer, quilt Applied to for working as in the uplink being directed in the first community in same subframe transmission and the second community The process of the uplink transmission power in radio terminal is controlled when uplink transmission dispatch radio terminal.

24. base station according to claim 23, wherein the instruction of 1 configuration information of layer is applied to first community and second community In uplink transmission overall transmission power maximum transmission power.

25. base station according to claim 23, wherein 1 configuration information of the layer instruction is applied to upper in first community First maximum transmission power of uplink transmission and the second maximum transmitted function transmitted applied to the uplink in second community Rate.

26. base station according to claim 25, wherein 1 configuration information of layer includes the Configuration Values of the first maximum transmission power With the deviant with the second value for obtaining the second maximum transmission power.

27. base station according to claim 16 or 17, wherein 2 configuration information of layer is applied to for when in same son For the uplink transmission in the first community and the uplink transmission scheduling radio in the second community in frame The process of the first MAC PDU and the 2nd MAC PDU are generated when terminal in the radio terminal.

28. base station according to claim 27, wherein the instruction of 2 configuration information of layer is answered during the generation of the first MAC PDU The preferential bit rate of first of logic channel for the network carrying (PBR) and it is applied to during the generation of the 2nd MAC PDU 2nd PBR of logic channel.

29. base station according to claim 27, wherein 2 configuration information of layer indicates first or second MAC PDU, for this It should preferentially guarantee the preferential bit rate (PBR) of the logic channel applied to the network carrying for first or second MAC PDU.

30. a kind of radio terminal, comprising:

Communication control unit, the communication control unit are configured to control dual link, which is related to wherein will be wireless The carrying separation that the network carrying between electric terminals and core network separates in first base station and the second base station,

Wherein, the communication control unit is further configured to receive the first control for being related to access layer from first or second base station Information processed is determined whether to require carrying separation based on the first control information, and is controlled according to the first control information using double The communication of connection, wherein

The first control information includes being applied to for generating in the radio terminal for by the first base station pipe The first media access control protocol data unit (MAC PDU) and be used for by institute that uplink in the first community of reason is transmitted 2 configuration information of layer of the process of the 2nd MAC PDU of the uplink transmission in the second community of the second BTS management is stated,

Wherein, 2 configuration information of layer includes indicating the generation of the 2nd MAC PDU prior to the first MAC The generation of PDU, to emit the information of the uplink data of the logic channel for the network carrying, and

Wherein, according to 2 configuration information of layer, generating has described the second of priority more higher than the first MAC PDU MAC PDU, to emit the uplink data of the logic channel for the network carrying.

31. radio terminal according to claim 30, wherein

In carrying separation, the second radio in the first radio bearer and the second community in the first community is held It carries the two and is mapped to the network carrying, and

First control information includes radio bearer configuration information, and the first and second radio bearers of instruction arrive the network carrying Mapping.

32. the radio terminal according to claim 30 or 31,

Wherein, the first control information indicates first or second base station, and radio terminal will be sent out to the first or second base station Scheduling request or random access channel (RACH) are penetrated so as to can in radio terminal in the data of the transmission for the network carrying The distribution of used time request uplink radio resources.

33. the radio terminal according to claim 30 or 31,

Wherein, the first control information includes 1 configuration information of layer, is applied to for described when being directed in same subframe In first community uplink transmission and the second community in uplink transmission scheduling radio terminal when control nothing The process of uplink transmission power in line electric terminals.

34. radio terminal according to claim 33,

Wherein, the instruction of 1 configuration information of layer is applied to the overall transmission power of the uplink transmission in first community and second community Maximum transmission power.

35. radio terminal according to claim 33,

Wherein, 1 configuration information of the layer instruction is applied to the first maximum transmission power of the uplink transmission in first community With the second maximum transmission power of the uplink transmission being applied in second community.

36. radio terminal according to claim 35,

Wherein, 1 configuration information of layer include the first maximum transmission power Configuration Values and with for obtain the second maximum transmission power Configuration Values deviant.

37. the radio terminal according to claim 30 or 31,

Wherein, 2 configuration information of layer is applied to for when the uplink being directed in the first community in same subframe Described the is generated in radio terminal when uplink transmission scheduling radio terminal in road transmission and the second community The process of one MAC PDU and the 2nd MAC PDU.

38. the radio terminal according to claim 37,

Wherein, the instruction of 2 configuration information of layer is applied to the first of the logic channel of the network carrying during the generation of the first MAC PDU Preferential bit rate (PBR) and the 2nd PBR for being applied to logic channel during the generation of the 2nd MAC PDU.

39. the radio terminal according to claim 37,

Wherein, 2 configuration information of layer indicates first or second MAC PDU, should preferentially protect for first or second MAC PDU Card is applied to the preferential bit rate (PBR) of the logic channel of the network carrying.

40. a kind of control method, comprising:

It is related to access layer from first base station to radio terminal transmitting and to be related to necessary to carrying isolated dual link the One control information, by the network carrying between radio terminal and core network in first base station and the in the carrying separates It is separated on two base stations, wherein

The first control information includes being applied to for generating in the radio terminal for by the first base station pipe The first media access control protocol data unit (MAC PDU) and be used for by institute that uplink in the first community of reason is transmitted 2 configuration information of layer of the process of the 2nd MAC PDU of the uplink transmission in the second community of the second BTS management is stated, and

Wherein, 2 configuration information of layer includes indicating the generation of the 2nd MAC PDU prior to the first MAC The generation of PDU, to emit the information of the uplink data of the logic channel for the network carrying.

41. control method according to claim 40, wherein

In carrying separation, the second radio in the first radio bearer and the second community in the first community is held It carries the two and is mapped to the network carrying, and

First control information includes radio bearer configuration information, and the first and second radio bearers of instruction arrive the network carrying Mapping.

42. the control method according to claim 40 or 41,

Wherein, the first control information instruction first base station or the second base station, radio terminal will be to the first base stations or the Two Base Transmitter scheduling requests or random access channel (RACH) so as in the data of the transmission for the network carrying in radio The distribution of uplink radio resources is requested when can be used in terminal.

43. the control method according to claim 40 or 41,

Wherein, the first control information includes 1 configuration information of layer, is applied to for described when being directed in same subframe In first community uplink transmission and the second community in uplink transmission scheduling radio terminal when control nothing The process of uplink transmission power in line electric terminals.

44. the control method according to claim 40 or 41,

Wherein, 2 configuration information of layer is applied to for when the uplink being directed in the first community in same subframe The first MAC PDU and described the are generated when uplink transmission scheduling radio terminal in transmission and the second community The process of two MAC PDU.

45. a kind of control method executed in radio terminal, the control method include:

It is received from first base station or the second base station and is related to access layer and is related to the first control information of dual link, the dual link relates to And carrying separation, by the network carrying between radio terminal and core network in first base station and the in the carrying separates It is separated on two base stations；And

Determine whether to require carrying separation based on the first control information, and is controlled according to the first control information using dual link Communication,

Wherein, the first control information includes being applied to for generating in the radio terminal for by first base The first media access control protocol data unit (MAC PDU) and be used for that uplink in the first community of station administration is transmitted By in the second community of second BTS management uplink transmission the 2nd MAC PDU process 2 configuration information of layer,

Wherein, 2 configuration information of layer includes indicating the generation of the 2nd MAC PDU prior to the first MAC The generation of PDU, to emit the information of the uplink data of the logic channel for the network carrying, and

Wherein, according to 2 configuration information of layer, generating has described the second of priority more higher than the first MAC PDU MAC PDU, to emit the uplink data of the logic channel for the network carrying.

46. a kind of non-transitory computer readable medium, storage is for promoting computer to execute according to claim 40,41 or 45 The program of the method.